Ishihara color test

book of 38 plates

Ishihara color test

book of 38 plates

General information | Standard equipment | Downloads |
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General information

This series of plates is designed to provide a test which gives a quick and accurate assessment of colour vision deficiency of congenital origin. This is the commonest form of colour vision disturbances.

Most cases of congenital colour vision deficiency are characterized by a red-green deficiency which may be of two types: first, a protan type which be absolute (protanapia) or partial (protanomalia), and secondly, a deutan type which may be absolute (deuteranopia) or partial (deuteranomalia).

• In protanopia, the visible range of the spectrum is shorter at the red end and compared with that of the normal, and that part of the spectrum which appears to the normal as blue-green, appears to those with protanopia as grey.
• In deuteranopia, that part of the spectrum which appears to the normal as green, appears as grey, and the visible range of the spectrum is divided by this zone into two areas, each of which appears to be of one system of colour.

In the congenital colour vision deficiencies, although very rare, there is total colour blindness which may be typical or atypical.
The subject who suffers from typical total blindness shows a complete failure to discriminate any colour variations, usually with an associated impairment of central vision with photophobia and nystagmus.

Standard equipment

Composed by 21 number plates and 17 images plates.



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